Scissors-grinding attachment.



E. G. LOOMIS. SOISSORS GRINDING ATTACHMENT. APPLICATION FILED JAN. 26, 1912.

Patented Nov. 11, 1913.

" UNITED STATES PATENT OFFICE EDWIN C. LOOMIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO SPENGLER BROTHERS COMPANY, OF CHICAGO, ILLINOIS, 'A CORPORATION OF ILLINOIS.

SGISSORS-GBINDING ATTACHMENT.

Specification of Letters Patent.

Patented Nov. 11, 1913.

Application filed January 26, 1912 Serial No. 673,620.

- To all whom it may concern:

- cago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements in Scissors-Grinding Attachments, of: which the following is a specification. I

This invention relates to an attachment for grinding machines, more particularly designated as a scissors grinding attache.

ment.

The principal object of the invention is to provide a removable device of the class described, which is simple, inexpensive and readily applicable, and is effective and efiicient in operation.

F or the attainment of this end and the accomplishment of other new and useful objects, the invention consists in the features of novelty in the construction, combination and arrangement of the several parts gener ally shown in the drawing, and described in the specification, but more particularly pointed out in the appended claims.

In the drawing, Figure 1 is a plan view of a grinding machine to which a scissors grinding attachment of the preferred construction is attached; Fig. 2 is a sectional view of the grinding machine with the said attachment in position as viewed on a line 22 of Fig. 1; Fig. 3 is aperspective view of the attachment; Fig. 1 is a sectional view showing a detailed construction of the attachment.

It is found desirable to provide a household knife grinding machine with means for grinding other articles, such, for example, as scissors and the like; as the'grinding of the latter articles requires that the edge. to be. ground be applied to a grinding surface at a different angle than the angle for grinding knives, it is necessary to provide an attachment by means of which the scissors may beheld at the proper angle for grinding their edges.

The present invention contemplates a device or attachment which may be readily applied to a grinding machine, and particularly to a grinding machine of the class described, shown in the accompanyin drawing, and which is described and claimed in rounded portion 15 at the bent ends.

my co-pending application for a knife rmder filed in the United States Patent flice on or about October 19th, 1911. Serial Number 655,619. I

,Referring now more particularly to the drawing and in the present exemplification of my invention, a knife grinder having a frame 10, formed of a single piece of metal which is adapted to support parallel sets of grinding wheels 11 and 12, rotatable in opposite directions together with the necessary operating mechanism, is also provided with the guide bars 13. These guide bars 13 are preferably disposed in a plane at an angle to the plane of the grinding wheels,

or more particularly, as shown in the drawing. One bar is opposite one of the wheels, and substantially in linewith it, while the other bar is substantially in linewith an oppositely rotating grinding wheel of the oppositely rotatable pair or set. These bars are of a height to extend slightly above the grinding elements, and one of the purposes of the bar is to provide a guideway for knives to be ground. The knives are pressed against the grinding elements between the bars 13, and are drawn back and forth across the grinding elements to effect. the even action upon the edge to be ground. The bars 13 may be secured to the frame 10 in any desired or suitable manner, such, for example, as by threading them into the frame, the tops of the bars being provided with slots 14, by means of whlch they may be inserted and removed.

It will be seen by reference to Fig. 2 that.

The scissors grinding attachment is applied to the. grinding machine by positioning it upon the tops of the bars 13. This scissors grinding attachment is preferably formed of a single pieceof metal of any desired or suitable kind. It is formed by folding a strip of metal upon itself, and forming a At a point intermediate of the bent end and the two other ends are corresponding grooves 16 and 17, which cooperate to form a second rounded portion or uidewa-y. These rounded portions interme iate of the ends and at the end of the device are substantially top of the rounded portion 15, and permits the attachment to beinserted over the bars 13 for substantially the whole width of the attachment, so that it may be retained positively in position upon the bars.

The metal of which the attachment iscomposed is preferably of suflicientjresilience to be somewhat springy, so that it must be pressed over' the ends of the bars, and is rigidly retained in position upon them. The free ends 19 and 20 of the attachment are preferably bent at an angle to the attach- .ment, and indifferent directions therefrom,

the outer surfaces of thev ends being in substantial alinement. The angle which the ends make with the device is such that when the attachment is in position upon the bars 13 the edges 19 and 20"will extend substantially at right angles to the grinding elements, and extend over one or more of the grinding elements.

The lower edge of the attachment is free of the grinding elements, and the bent ends 19 and 20 are adapted to provide an abutment for positioning the member to be ground, in grinding position. It will be noticed by reference to Fig. 2 that the lower edge of the ends 19 and 20 which are nearest the grinding element are disposed at a point to the top of the grinding element, so that .a member to be ground, held against the ends 19 and 20 and pressed in engagement with the grinding element, as 12, will be ground at an angle to the ends.

- In the preferred construction of the attachment the upper portion of the free end 20 is preferably removed as at 21, and the end 19 is preferably shorter than the end 20, as shown in the drawing. The reason for this construction is to provide a device ,which shall-present as little obstruction as POSSlblQ at the upper edge, and which may be as nearly flat as desired to occupy the least space possible. It is evident from this description of the device that it is readily placed in position and removed, and that it is adapted to provide an abutment for grinding scissors and other similar articles which have a cutting edge different than knives. This device is particularly adapted to be used in connection with a grinding device of the class shown and described, but it is evident that it may also have a broader application to any grinding device which has a circular grinding element.

It is also evident that the attachment may be supported by bars or pins 13 disposed at the side of the grinding element and at such a point that the ends may make any desired angle With the grinding surface.

The abutment is preferably disposed over the outer grinding element on the same side as the handle member, so that the member to be ground may be in plain view of the one operating the handle.

What I claim is:

1. The combination of a rotatable circular knife grinder having two vertical guide bars,- of a scissors grinding attachment adapted to engage and to be supported in position by both of said bars in proximityto the grinding'surface of the knife grinder. 2. The combination of a rotatable circular 'lmife grinder having vertical guide bars arranged in a plane at an angle to the plane of the grinder, and a scissorsgrinding attachment supported by said bars at the top thereof, with a guiding portion extending transversely of the guiding member. and having a portion to engage the said bars at the top to hold the attachment-in-position.

3. The combination of a rotatable. circular knife grinder having vertical guide bars arranged in a plane at an angle to the plane of the grinder, and a scissors grinding attachment slidable over the top of said guide bars and havin a projectin portion to engage the top of one of the ars to prevent the attachment from sliding downwardly and to position the lower edge thereof with respect to the grinding member.

4. The combination of a rotatable circular knife grinder having vertical guide bars arranged in a plane at an angle to the plane of the grinder, and a scissors grinding attachment supported by said bars at the top thereof, and having an abutment portion extending over the said grinder at right angles thereto.

5. scissors grinder attachment for a grlnding machine consisting of a metal clip grooves for connection with grinding machine consisting of a folded metal clip with a rounded portion at the folded end, and grooves spaced from the ends cooperating to form a parallel rounded 1 e. s t

7 A scissors grinder attachment for a grinding machine consisting of a folded metal clip with ends bent at angles in opposite'directions from the folded portion.

8. A; scissors grinder attachment for a grinding machine consisting of a metal clip folded upon itself and formed at the folded end with a rounded portion, cooperating grooves spaced from the folded end and forming a guideway parallel with the said portion, and with the free ends of the cli bent in opposite directions and at subordinate angles.

9. An attachment for a grinding machine, comprising parallel rounded guideways, one of said guide Ways being upset or battered at the end to prevent a bar from slipping through the guide Way. ,7

10. The combination with a grinding ma chine, of guide bars in proximity to the grinding element, and an attachment consisting of a clip having rounded guides to adapt the clip to beheld by the said bars, and having an upset or battered end to limit the movement of the clip upon the bars.

11. The combination with a 'inding machine, of guide bars in prommity to the grinding element, and an attachment consisting of a clip having rounded guides to adapt the clip to he held by the said bars and with extending ends bent at angles to the folded portion and projecting across the grinding element at right angles thereto.

12. The combination Witha grinding machine, of guide bars in proximity to the grinding element, and an attachment consisting of a clip having rounded guides to adapt the clip to be held-by the said bars and with extending ends bent at different angles to the folded portion to form an 'alined abutment extending above and across the grinding element at right angles thereto and making a difierent angle with the surface of the grinding element.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 23rd day of January, A. D. 1912.

EDWIN CLLQOMIS.

Witnesses:

SIGNE V. JoHNsoN, EDITH K. LEAMY. 

